6641331660 has 36 divisors (see below), whose sum is σ = 20145373248. Its totient is φ = 1771021728.

The previous prime is 6641331643. The next prime is 6641331667. The reversal of 6641331660 is 661331466.

6641331660 is a `hidden beast` number, since 6 + 641 + 3 + 3 + 1 + 6 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6641331667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18447964 + ... + 18448323.

Almost surely, 2^6641331660 is an apocalyptic number.

6641331660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6641331660 is an abundant number, since it is smaller than the sum of its proper divisors (13504041588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6641331660 is a wasteful number, since it uses less digits than its factorization.

6641331660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36896302 (or 36896297 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 6641331660 is about 81494.3658175214. The cubic root of 6641331660 is about 1879.6849158842.

The spelling of 6641331660 in words is "six billion, six hundred forty-one million, three hundred thirty-one thousand, six hundred sixty".